refactor user login:

1. opt request json type.
2. desktop and mobile use same loginDialog.
3. opt loginDialog UI style.
4. opt login request Exception catch.

flutter/lib/models/ab_model.dart

@@ -27,8 +27,7 @@ class AbModel {
     abError.value = "";
     final api = "${await bind.mainGetApiServer()}/api/ab/get";
     try {
-      final resp =
-          await http.post(Uri.parse(api), headers: await getHttpHeaders());
+      final resp = await http.post(Uri.parse(api), headers: getHttpHeaders());
       if (resp.body.isNotEmpty && resp.body.toLowerCase() != "null") {
         Map<String, dynamic> json = jsonDecode(resp.body);
         if (json.containsKey('error')) {
@@ -102,7 +101,7 @@ class AbModel {
   Future<void> pushAb() async {
     abLoading.value = true;
     final api = "${await bind.mainGetApiServer()}/api/ab";
-    var authHeaders = await getHttpHeaders();
+    var authHeaders = getHttpHeaders();
     authHeaders['Content-Type'] = "application/json";
     final peersJsonData = peers.map((e) => e.toJson()).toList();
     final body = jsonEncode({

flutter/lib/models/group_model.dart

@@ -59,7 +59,7 @@ class GroupModel {
               if (gFFI.userModel.isAdmin.isFalse)
                 'grp': gFFI.userModel.groupName.value,
             });
-        final resp = await http.get(uri, headers: await getHttpHeaders());
+        final resp = await http.get(uri, headers: getHttpHeaders());
         if (resp.body.isNotEmpty && resp.body.toLowerCase() != "null") {
           Map<String, dynamic> json = jsonDecode(resp.body);
           if (json.containsKey('error')) {
@@ -110,7 +110,7 @@ class GroupModel {
               'grp': gFFI.userModel.groupName.value,
               'target_user': username
             });
-        final resp = await http.get(uri, headers: await getHttpHeaders());
+        final resp = await http.get(uri, headers: getHttpHeaders());
         if (resp.body.isNotEmpty && resp.body.toLowerCase() != "null") {
           Map<String, dynamic> json = jsonDecode(resp.body);
           if (json.containsKey('error')) {

flutter/lib/models/user_model.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 
+import 'package:flutter_hbb/common/hbbs/hbbs.dart';
 import 'package:flutter_hbb/common/widgets/peer_tab_page.dart';
 import 'package:get/get.dart';
 import 'package:http/http.dart' as http;
@@ -45,7 +46,9 @@ class UserModel {
       if (error != null) {
         throw error;
       }
-      await _parseUserInfo(data);
+
+      final user = UserPayload.fromJson(data);
+      await _parseAndUpdateUser(user);
     } catch (e) {
       print('Failed to refreshCurrentUser: $e');
     } finally {
@@ -55,7 +58,6 @@ class UserModel {
 
   Future<void> reset() async {
     await bind.mainSetLocalOption(key: 'access_token', value: '');
-    await bind.mainSetLocalOption(key: 'user_info', value: '');
     await gFFI.abModel.reset();
     await gFFI.groupModel.reset();
     userName.value = '';
@@ -63,11 +65,10 @@ class UserModel {
     statePeerTab.check();
   }
 
-  Future<void> _parseUserInfo(dynamic userinfo) async {
-    bind.mainSetLocalOption(key: 'user_info', value: jsonEncode(userinfo));
-    userName.value = userinfo['name'] ?? '';
-    groupName.value = userinfo['grp'] ?? '';
-    isAdmin.value = userinfo['is_admin'] == true;
+  Future<void> _parseAndUpdateUser(UserPayload user) async {
+    userName.value = user.name;
+    groupName.value = user.grp;
+    isAdmin.value = user.isAdmin;
   }
 
   Future<void> _updateOtherModels() async {
@@ -85,7 +86,7 @@ class UserModel {
                 'id': await bind.mainGetMyId(),
                 'uuid': await bind.mainGetUuid(),
               },
-              headers: await getHttpHeaders())
+              headers: getHttpHeaders())
           .timeout(Duration(seconds: 2));
     } catch (e) {
       print("request /api/logout failed: err=$e");
@@ -95,26 +96,38 @@ class UserModel {
     }
   }
 
-  Future<Map<String, dynamic>> login(String userName, String pass) async {
+  /// throw [RequestException]
+  Future<LoginResponse> login(LoginRequest loginRequest) async {
     final url = await bind.mainGetApiServer();
+    final resp = await http.post(Uri.parse('$url/api/login'),
+        headers: {'Content-Type': 'application/json'},
+        body: jsonEncode(loginRequest.toJson()));
+
+    final Map<String, dynamic> body;
     try {
-      final resp = await http.post(Uri.parse('$url/api/login'),
-          headers: {'Content-Type': 'application/json'},
-          body: jsonEncode({
-            'username': userName,
-            'password': pass,
-            'id': await bind.mainGetMyId(),
-            'uuid': await bind.mainGetUuid()
-          }));
-      final body = jsonDecode(resp.body);
-      bind.mainSetLocalOption(
-          key: 'access_token', value: body['access_token'] ?? '');
-      await _parseUserInfo(body['user']);
-      return body;
-    } catch (err) {
-      return {'error': '$err'};
-    } finally {
-      await _updateOtherModels();
+      body = jsonDecode(resp.body);
+    } catch (e) {
+      print("jsonDecode resp body failed: ${e.toString()}");
+      rethrow;
     }
+
+    if (resp.statusCode != 200) {
+      throw RequestException(resp.statusCode, body['error'] ?? '');
+    }
+
+    final LoginResponse loginResponse;
+    try {
+      loginResponse = LoginResponse.fromJson(body);
+    } catch (e) {
+      print("jsonDecode LoginResponse failed: ${e.toString()}");
+      rethrow;
+    }
+
+    if (loginResponse.user != null) {
+      await _parseAndUpdateUser(loginResponse.user!);
+    }
+
+    await _updateOtherModels();
+    return loginResponse;
   }
 }